Greek Tragedy or Farce: The life and career of Rudy Giuliani

At the heart of the recent US impeachment investigation of President Donald Trump was Trump’s personal lawyer and former Mayor of New York - Rudy Giuliani.

Officially Giuliani has no role in the Trump administration yet, he seems to wield considerable political influence. So, who is Rudy Giuliani, how should we understand his relationship with President Donald Trump and how and why did he become involved in the Ukraine?